Help with CPU.hdl and A register

[asmhack]

Hi,

I can't figure out why CPU.hdl won't work as expected. I've gotten as far as Line 32 in the tests, but something is still off.

Should the load for the A register be the same as the select for the first Mux? Can someone kindly have a quick look at my practically finished CPU.hdl? Thanks

[cadet1620]

asmhack wrote

Should the load for the A register be the same as the select for the first Mux? Can someone kindly have a quick look at my practically finished CPU.hdl? Thanks

The A register must also be loaded whenever the A dest bit is set in C-instructions so that instructions with A= will store their result.

If you can't get your CPU working, you can email it to me and I'll give you more help debugging it.

--Mark

[asmhack]

Thanks Mark! that helped.